BofA identifies a pattern where the last three major equity bubbles burst after yields jumped more than 2 points. Other historic peaks in market concentration include the Nifty Fifty growth stocks at 40%, the 1980s Japanese bubble at 44%, and the US railroad bubble, which reached 63% of total market capitalization.
Tuesday, October 20, 2026
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AI Big 10 Reaches Dot Com Bubble Peak of 41% of US Market
US Markets23 days ago
Bank of America analysts warn that the 10-year Treasury yield has risen 1.27 points since February, moving toward thresholds that often precede market crashes. This interest rate climb coincides with a surge in asset concentration as the "AI Big 10" now represents 41% of total US stock market capitalization. The group, which includes the Magnificent 7, Broadcom, AMD, and Micron, has reached a market weight equal to the peak of the dot-com bubble in 2000.
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